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| 1 // Copyright 2010 the V8 project authors. All rights reserved. | 1 // Copyright 2011 the V8 project authors. All rights reserved. |
| 2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
| 3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
| 4 // met: | 4 // met: |
| 5 // | 5 // |
| 6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
| 7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
| 8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
| 9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
| 10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
| 11 // with the distribution. | 11 // with the distribution. |
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| 27 | 27 |
| 28 #ifndef V8_DOUBLE_H_ | 28 #ifndef V8_DOUBLE_H_ |
| 29 #define V8_DOUBLE_H_ | 29 #define V8_DOUBLE_H_ |
| 30 | 30 |
| 31 #include "diy-fp.h" | 31 #include "diy-fp.h" |
| 32 | 32 |
| 33 namespace v8 { | 33 namespace v8 { |
| 34 namespace internal { | 34 namespace internal { |
| 35 | 35 |
| 36 // We assume that doubles and uint64_t have the same endianness. | 36 // We assume that doubles and uint64_t have the same endianness. |
| 37 static uint64_t double_to_uint64(double d) { return BitCast<uint64_t>(d); } | 37 inline uint64_t double_to_uint64(double d) { return BitCast<uint64_t>(d); } |
| 38 static double uint64_to_double(uint64_t d64) { return BitCast<double>(d64); } | 38 inline double uint64_to_double(uint64_t d64) { return BitCast<double>(d64); } |
| 39 | 39 |
| 40 // Helper functions for doubles. | 40 // Helper functions for doubles. |
| 41 class Double { | 41 class Double { |
| 42 public: | 42 public: |
| 43 static const uint64_t kSignMask = V8_2PART_UINT64_C(0x80000000, 00000000); | 43 static const uint64_t kSignMask = V8_2PART_UINT64_C(0x80000000, 00000000); |
| 44 static const uint64_t kExponentMask = V8_2PART_UINT64_C(0x7FF00000, 00000000); | 44 static const uint64_t kExponentMask = V8_2PART_UINT64_C(0x7FF00000, 00000000); |
| 45 static const uint64_t kSignificandMask = | 45 static const uint64_t kSignificandMask = |
| 46 V8_2PART_UINT64_C(0x000FFFFF, FFFFFFFF); | 46 V8_2PART_UINT64_C(0x000FFFFF, FFFFFFFF); |
| 47 static const uint64_t kHiddenBit = V8_2PART_UINT64_C(0x00100000, 00000000); | 47 static const uint64_t kHiddenBit = V8_2PART_UINT64_C(0x00100000, 00000000); |
| 48 static const int kPhysicalSignificandSize = 52; // Excludes the hidden bit. | 48 static const int kPhysicalSignificandSize = 52; // Excludes the hidden bit. |
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| 229 biased_exponent = static_cast<uint64_t>(exponent + kExponentBias); | 229 biased_exponent = static_cast<uint64_t>(exponent + kExponentBias); |
| 230 } | 230 } |
| 231 return (significand & kSignificandMask) | | 231 return (significand & kSignificandMask) | |
| 232 (biased_exponent << kPhysicalSignificandSize); | 232 (biased_exponent << kPhysicalSignificandSize); |
| 233 } | 233 } |
| 234 }; | 234 }; |
| 235 | 235 |
| 236 } } // namespace v8::internal | 236 } } // namespace v8::internal |
| 237 | 237 |
| 238 #endif // V8_DOUBLE_H_ | 238 #endif // V8_DOUBLE_H_ |
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